21090680

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{40559}}^1$

素因数の和:40583

約数の個数: 32

約数和(自身を含む): 51105600

約数和(自身を除く): 30014920

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 520, 40559, 81118, 162236, 202795, 324472, 405590, 527267, 811180, 1054534, 1622360, 2109068, 2636335, 4218136, 5272670, 10545340, 21090680]

約数ペア:

[(1, 21090680), (2, 10545340), (4, 5272670), (5, 4218136), (8, 2636335), (10, 2109068), (13, 1622360), (20, 1054534), (26, 811180), (40, 527267), (52, 405590), (65, 324472), (104, 202795), (130, 162236), (260, 81118), (520, 40559)]